Effects of Addition of Hydrogen Peroxide and/or Calcium Carbonate on Ozone-Decomposition of Phenol Sparingly Dissolved in Water

Abstract

In the present work, we investigated the degradation behavior of phenol sparingly dissolved in water with ozone treatment with/without subsidiary additions of CaCO 3 and/or H 2 O 2 . The enhancement effects of these additives for ozone-oxidation processing were investigated based on the variation of pH value and amounts of organic acids produced in the aqueous phase. Addition of a small amount of CaCO 3 in the aqueous phase, which could maintain the pH in a range of high values, resulted in a significant enhancement on the ozone-degradation rate of phenol instead of giving rise to negative scavenger effects. Addition of H 2 O 2 under the presence of 0.1 g/L of CaCO 3 in the aqueous phase most enhanced the ozone-degradation of phenol in a range of dissolved ozone concentrations examined and caused small net production of organic acid components. The apparent first-order rate constant for phenol degradation was well correlated in terms of the dissolved ozone concentration under the influences of the addition of oxidation promoters for practical purposes.

Evaluation of advanced oxidation processes (AOP) using O3, UV, and TiO2 for the degradation of phenol in water

“…TiO 2, which is chemically stable and safe, was used as the photocatalyst. Phenol was selected as the material for decomposition, because phenol processing is very difficult, and it is frequently used in the chemical industry [23]. The effects on the phenol decomposition activity of this reactor of using ozone or UV irradiation alone, and a combination of ozone, UV, and TiO 2 were examined.…”